Encyclopedias, Almanacs, Transcripts, and Maps
- Crummell, Alexander
- Crusades: Christian Perspective
- Crusades: Muslim Perspective
- Cruzen, Paul J. (1933 – ) Dutch Meteorologist
- Ctenophora (Comb Jellies)
- Cubatao, Brazil
- Cubozoa (Box Jellies)
- Cuckoo-Shrikes (Campephagidae)
- cuckoopint
- Cuculiformes (Cuckoos, Anis, and Roadrunners)
- Culianu, Ioan Petru
- Cult of Saints
- Cults and Sects
- Cultural Eutrophication
- Culture and Energy Usage
- Culture Heroes
- Cumacea (Cumaceans)
- Cumont, Franz
- Cuna Religion
- Curassows, Guans, and Chachalacas (Cracidae)